package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.UUID;

@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.pic-path}")
    private String basePath;

    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){

        //获取原始文件名
        String originalFilename = file.getOriginalFilename();
        //获取文件后缀
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //随机生成文件名，保持文件名不重复
        String fileName = UUID.randomUUID().toString() + suffix;
        //确保文件夹存在
        File dir = new File(basePath);
        if (!dir.exists()){
            dir.mkdirs();
        }

        try {
            file.transferTo(new File(basePath +fileName));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        return R.success(fileName);
    }

    /**
     * 文件下载
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){

        try {
            //1读取文件
            BufferedInputStream bis = new BufferedInputStream(new FileInputStream(new File(basePath + name)));
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");
            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len =  bis.read(bytes)) != -1 ){
                //字节流响应请求
                outputStream.write(bytes,0,len);
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }



    }

}
